Disable and enable ping on Linux servers

Disable and enable ping on Linux servers

Modify/proc/sys/net/ipv4/icmp_echo_ignore_all to 1. Disable ping from 0.

Sysctl-w net. ipv4.icmp _ echo_ignore_all = 1.

Another method is iptables-based ping.

Iptables-a input-p icmp -- icmp-type 8-s 0/0-j DROP

The ping Command sends an ICMP request packet to the destination IP address, and then the destination IP address returns an ICMP packet. The preceding command discards the ICMP packet of the request using iptables to disable ping.

In the preceding three methods, they are all temporary modifications and will expire after the machine is restarted. To take effect permanently, change the/etc/sysctl. conf file.

In the/etc/sysctl. conf file, add

Net. ipv4.icmp _ echo_ignore_all = 1

Then run sysctl-p